В Present Continuous.

a) Tom … (help) his grandfather now.
b) … (they / swim) in the river at the moment?
c) I … (cook) dinner now.
d) You … (not / clean) the room at the moment.
e) Bill … (fix) a bike now.
f) We … (not / watch) TV at the moment.
g) They … (read) books now.
h) … (Susan / make) a cake now?